Abstract

Recent political priorities in Europe aim to: rationalize agricultural production,
reduce pollution, upgrade the environment, maintain rural infrastructures and to
meet new societal concerns such as product quality and animal welfare.
The problems of zootechnical sustainability appear to be of a very complex
nature.
Today, the main approach used to study the complexity of the phenomenon is the
use of simulation models.In this thesis the application of simulation models is
supported by the integration of informatics systems GIS.
This thesis propose two studies. The first is the implementation of GIS with the
EISR mathematical model for the planning and management of the stocking rate
for all the Sardinian region territory, with detail of 1:50.000, in order to evaluate
areas of Sardinia that are at risk of desertification following the activities of
animal breeding. The amendments to this process for the decade 1995-2005, have
also been assessed.
The second regards the use of GIS for the management of marginal pasture areas
of the Goceano region (SS). Thirteen farms were studied and we used their
econimical and managing data as input of our matematical models. Through this
mathematical models we calculated: stocking rates (ABU ha/year), nitrogen
excretions, and net profit/ABU. These parameters were spazialized by using GIS
software and then we create the relative mapping. This analysis allowed us to
evaluate the sustainability of zootechnical farms in this study area.